/*
 * Copyright 2013-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.caffeinedemo.demos.web;

import com.github.benmanes.caffeine.cache.Cache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.Calendar;
import java.util.Timer;

/**
 *
 */
@Controller
public class BasicController {
    @Autowired
    private Cache<Long, User> caffeineCache;
    @GetMapping("/user")
    @ResponseBody
    public User getUser(@RequestParam(name = "userId") Long userId) {
        // 从缓存获取，如果不存在则加载
        // 这里是缓存未命中时的加载逻辑
        return caffeineCache.get(userId, this::loadUserFromDatabase);
    }

    @PostMapping("/user")
    @ResponseBody
    public void updateUser(@RequestBody User  user) {
        // 更新数据库
        saveUserToDatabase(user);
        // 手动失效缓存
        caffeineCache.invalidate(user.getUserId());
    }

    private void saveUserToDatabase(User user) {
        System.out.println("save user to database");
    }

    private User loadUserFromDatabase(Long key) {
        return new User.UserBuilder()
                .userId( key)
                .name("shen" + Calendar.MINUTE)
                .age(18)
                .build();
    }
}
